Air conditioning control apparatus



June 23, 1964 J. BERGER 3,138,326

AIR CONDITIONING CONTROL APPARATUS Filed Aug. 23, 1962 I 3 Sheets-Sheetl INVENTOR. AZVAVJBEEGE'E I 2 4770P/1/EV June 23, 1964 A. J. BERGER AIRCONDITIONING CONTROL APPARATUS 5 Sheets-Sheet 2 Filed Aug. 25, 1962TEMPERATURE SENSOR INVENTOR. ALI/YA/J 35562;?

5 AZ, ATTORNEY June 23, 1964 A. J. BERGER AIR CONDITIONING CONTROLAPPARATUS 3 Sheets-Sheet 3 Filed Aug. 23, 1962 INVENTOR. A: VIA/clBERGER 4rroe/va United States Patent "ice 3,138,326 AIR CQNDETEQNINGCONTRGL APPARATUS Alvin .I. Berger, Morton Grove, iii, assignor toMinneapolis-Honeyweli Regulator Company, Minneapolis, Minn, acorporation of Delaware Filed Aug. 23, 1962, Ser. No. 218,923 13 Claims.(Cl. 2361) This invention relates to air conditioning control apparatusand more particularly to an improved valving system of the turbine typeadapted to control air distribution units such as fan coil or inductiontype air conditioners.

Air conditioning control apparatus for unit ventilators and airdistribution units are well recognized and the commonly assignedcopending application of Richard C. Mott, Serial No. 189,023, filedApril 20, 1962, discloses such a unit utilizing a turbine driven valveoperator. The present invention is directed to an improvement over thedisclosure in the Mott application in that it provides proportioningcontrol rather than on-ofI or floating type control, and a more simpledesign of nozzle and turbine assembly and means for controlling the samewith improved means for switchover in the operation of the apparatus andin the sensing units.

Therefore it is an object of this invention to provide an improved airconditioning control apparatus of the selfcontained turbine drive type.Another object of this invention is to provide an improved proportioningtype air conditioning control apparatus. A still further object of thisinvention is to provide in an improved air conditioning controlapparatus, a turbine drive actuator in a control system of theself-contained type with provision for feedback to provide proportioningcontrol operation. Another object of this invention is to provide asystem of this type with simplified changeover operation for direct andreverse operation of the actuator from the same primary controller.These and other objects of this invention will become apparent from areading of the attached description together with the drawings wherein:

FIGURE 1 is a schematic disclosure of an air distribution unit utilizingimproved control apparatus in the control of a valve to a heatexchanger,

FIGURE 2 is a diagrammatic disclosure of the improved turbine driveapplied to a valve,

FIGURE 3 is a schematic disclosure of a portion of the turbine,

FIGURE 4 is a schematic disclosure of the pneumatic control system,

FIGURE 5 is a schematic disclosure of the second type of unit ventilatorof the induction type, utilizing the improved turbine drive valve as adamper operator, and

FIGURE 6 is a schematic disclosure of a second em bodiment of thepneumatic control system.

The disclosure of FIGURE 1 shows an application of the improved airconditioning control apparatus to a unit ventilator or air distributionunit of the type which receives a supply of circulated air for aircirculation purposes. The air distribution is shown schematically ascomprising a box 10 having an air inlet conduit or supply conduit 12connected thereto and a discharge opening indicated generally at 14. Theunit is designed to be positioned in or adjacent to a space to be airconditioned such as is indicated in phantom at 20. Circulated air istempered by means of fiow of the air conditioning medium or temperingmedium through a heat exchanger such as indicated at 21 from a supplyconduit indicated at 23. Flow of the air conditioning medium through theheat exchanger from the supply conduit is controlled by means of a valve22 controlled or operated by the improved turbine drive apparatusindicated generally at 30.

Patented June 23, 1964 Return of the air conditioning medium to thesource is through the return conduit 25. The turbine actuator which willbe more fully disclosed in FIGURES 2, 3 and 4 receives a supply of airconditioning medium for driving purposes through a conduit indicated at28. Similarly a control conduit indicated at 32 is connected to athermostat indicated generally at 35 positioned in the space to be airconditioned.

As will be best seen in FIGURES 2, 3 and 4, improved turbine actuator iscomprised of a turbine wheel 38 which is pivoted or mounted on a shaftas at 40 and has associated therewith a nozzle manifold 42 positionedadjacent to and fitting around a substantial portion of the turbinewheel. The manifold has an inlet conduit indicated at 44 and a pair ofdischarge nozzle sections near the extremities of the same indicated at45, 46 which are effective to discharge air unto opposite surfaces ofthe turbine wheel. These nozzle sections are shaped to direct air flowsubstantially normal to the blade surface of the blades of the turbinewhich are radially positioned so that each nozzle is effective todirect'air impinging directly on the blades adjacent the same in such amanner as to cause rotation of the Wheel in opposite directions. Byproportioning the air being ejected or directed from the nozzle sectionson the blades of the turbine wheel, the turbine will assume theresultant rotation in a direction determined by the predominance of airbeing directed from one or the other of the respective nozzle sections.With this arrangement only a single set of blades is required on theturbine wheel and the blades need not be directionally positioned butare rather directed radially on the periphery of the wheel in aconventional manner, simplifying the structure of the same.

The use of the turbine or its cooperation with the remaining parts ofthe control apparatus will best be seen in the schematic disclosure ofFIGURE 4 which relates to the diagrammatic disclosure of FIGURE 2. Thus,as best seen in FIGURE 4 the turbine wheel 38 has associated therewiththe manifold 42 with the nozzle sections 46, 45 which receives airthrough the air inlet 44 which is connected to the sources of airconditioning mediumsuch as is indicated at 12 in FIGURE 1 through asupply conduit 28. Positioned within the nozzle manifold 42 is adiverting means or valve means indicated by the blade 51 in FIGURE 4which is pivoted such as at 52 and connected through a linkage 55 to arelay or motive means generally indicated at 56. This motive meansincludes a diaphragm 58 cooperating with a housing structure 59 todefine a pair of chambers 60, 61. The diaphragm 58 has a suitableconnecting portion 63 to which the shaft or operating means 55 isconnected such that diaphragm movement will be imparted to the shaft topivot the valve means or blade 51 within the nozzle manifold 42. Chamber61 may include a return spring (not shown) to bias the diaphragm in apredetermined direction and the shaft 55 is sealed yet movable throughthe Wall of the casing or housing 59 of the relay or motive means 56.The respective chambers 60, 61 of the pressure responsive motive meansor relay receive pressure signals established by the primary controlleror thermostat 35 and a feedback valve or flapper nozzle indicatedgenerally at 65, to be more fully described. The air source for thecontrol signals is taken from the supply conduit 28 connected through aconduit indicated at 68. This conduit is connected through a filterindicated generally at 76 and a pair of restrictions '72, 73. Therestrictions are located in separate conduits 75, 76 branching off ofthe filter and extending through a switchover valve 8i) designed tointerchange the connections of these conduits to the relay 56, as willbe later defined. The conduit extends through the switchover valve 80and through conduit 32 to the thermostat 35 indicated generally asincluding a bimetal 83 cooperating with a nozzle 84 terminating at theend of the control conduit 32. Similarly, the control conduit 76extending from the switchover valve to a conduit 77 which terminates ina nozzle 88 cooperating with a pivoted flapper 89 of the nozzle flapper65 which is moved by a cam 90 attached to the output shaft or the outputgearing (shown only in FIGURE 2) of the turbine. This output gearing isindicated generally at 95 and the cam is so shaped as to have riseportions indicated at 93, 94 at diametrically opposite positions withdwell portions adjacent thereof, the rise portions corresponding toextremes of movement of the output gearing of the turbine when attachedto an associated control device. Also included in cam 90 are slots 91,92 which are designed to limit rotation of the cam and hence the geartrain so that the apparatus will properly reverse upon temperatureswitchover of the system involved. Associated with the slots 91, 92 is apivoted lever 96 having pins 97, 99 thereon. This lever is pivoted by aportion 101 of an expansion element for a temperature sensor 98 (to belater defined) so that one or the other of the pins 97, 99 arepositioned in their respective slots 91, 92 depending upon which surfacethe follower 89 is engaging. When the cam rise portion moves thefollower 89 relative to the nozzle 88, pressure will build up in theconduit 76 as the flapper approaches the nozzle to increase the branchline or feedback pressure in the conduit 76. Connected to the conduit75, 76 ahead of the switchover valve are conduits 95, 96 respectivelywhich lead to the chambers 60, 61 of the pressure responsive relay ormotive means for pivoting the damper or valve in the nozzle manifold 42.Thus, as will be seen in FIGURE 4, thermostat 35 will establish a branchline pressure in the conduits 75 and 95 connected from the source andbeyond the restriction whenever the switchover valve directly connectsthe conduits 75 and 32 together. This will establish the branch linepressure in the relay chamber to operate on the diaphragm 58. At thesame time the source supply conduit will supply air to the controlconduits 76, 77 and 96 and to the chamber 61 of the relay wherein thefeedback pressure from the nozzle flapper assembly will be present.Movement of the output gearing will vary this feedback pressure andincrease the same as the end of stroke is reached to vary thedilferential pressure between the chambers 60, 61 and tend to return thevalve 51 associated therewith in the nozzle manifold to a normal orneutral position wherein both nozzles receive the same amount of air androtation of turbine wheel 38 is reduced and finally stopped.

It will be seen in FIGURE 4 that the switchover valve 80 is conventionaland has basically two positions of operation such as is shown by thestraight through conduits indicated in phantom in the block 80 and thereversing conduits indicated by the block 80 in phantom connected by abroken line thereto. The valve 80 is operated between these twopositions by means of a temperature sensor indicated in block at 98,which as will be seen in FIGURE 2, is designed to be associated with thesupply of the air conditioning or tempering medium supplied to the heatexchanger.

Referring to FIGURE 2, the turbine operated valve 30 is shown in adiagrammatic form. The turbine wheel 38 is mounted on the shaft 40 whichis connected to the output gearing section 95 with the cam 90 therein.This output gearing drives a rotary positioned valve plug (not shown) ina valve 109 which is connected to the supply conduit 23 for thetemperature changing medium and leads therefrom through the heatexchanger 21. The nozzle manifold 42 has its inlet passage 44 connectedto the supply conduit 28 leading to the circulated air source 12 of theunit ventilator as shown in FIGURE 1. Connected off of the supplyconduit 28 is the control conduit 68 leading through a filter section tothe relay chamber 56 or motive means. Control passages within thiscasing lead through the switchover valve indicated in block at to thecontrol conduits 32 and 76 respectively. These conduits are connected tothe thermostats or primary controller 35 and into the output gearing andcam section to the nozzle flapper section located within this section(not shown). The changeover temperature sensor 98 is included at theinlet to the valve and includes a thrust section 110 operating through apivoted linkage 111 to move a valve assembly within the changeover valve80. The output of the pressure motive means or the shaft 55 leads to thepivoted linkage indicated at 112 which operates the pivoted blade (notshown) in the nozzle manifold 42.

Thus, it will be seen that the thermostat or primary controller 35 willestablish a branch line pressure in the conduit 95 and hence the motivechamber 60 of the pressure actuated relay 56 in accordance with thetemperature sensed in the space to be air conditioned and causepositioning of the splitter valve or blade 51 within the nozzle manifold42 to vary the amount of air emanating or being directed from the nozzle45, 46. This will differentially cause rotation of the turbine wheel 38in one direction or the other to drive the output gearing and hence thevalve associated therewith in an opening direction. The disclosure inFIGURE 4 shows a cam with two high points on the same and dwell portionsadjacent thereto such that maximum feedback will be limited to theextremes of travel, here 180 of rotation of the output shaft. The camconfiguration for a two-way valve will actually have only one high pointand will provide maximum feedback in the maximum opening position andthe dwell portion will correspond with the closed position of the valveor the minimum feedback. Limit positioning apparatus is shown inconnection with the cam but it will be understood that such apparatusmay be included in the controller with which the actuator is associated.Thus, for the purpose of the disclosure of FIG- URE 2, in a two-positionvalve the turbine may be used which will move from a normal or closedposition of the valve at which the cam nozzle flapper arrangement willbe in the position of minimum feedback or on the dwell portion of thecam toward the position of rise and maximum feedback as the valve isopened. In the two positioning device, the remaining portion of the camwill not be used and output movement will be limited by the limits ofmovement of the valve assembly.

Whenever the temperature changing medium flowing through the heatexchanger 21 is used for heating, the turbine will be caused to rotatein a predetermined direction to cause closing of the valve upon a risein temperature and drop in control pressure or branch line pressure inthe conduit 95 and hence the chamber 60 of relay 56. When thetemperature changing medium is used for cooling, the same thermostat maybe used except that the switchover vlave will interchange theconnections between the chambers 60, 61 from the space controller 35 andthe feedback assembly 65 as well as the stops on the cam so that thethermostat or branch line pressure will be established in the conduit 96of chamber 61, causing opposite rotation of the turbine for the sametype of thermostat movement to reverse the operation of the controller.

The disclosure of FIGURE 5 is basically the same turbine operatorstructure except that the turbine is connected in a damper applicationrather than a valve application. The air distribution unit in FIGURE 5schematically depicts an induction type unit ventilator in which thecasing 115 is divided into a plurality of chambers, one of whch includesa duct for the source of circulated air. This source is connectedthrough a supply conduit indicated in phantom at to an aspirator sectionof the induction unit. The casing 115 includes a recirculated air gridor entrance 132 at one surface of the lower extremity. Entrance 132 hasa damper associated therewith as at 135 operated through a connectingmechanism 141) leading to a pivoted lever 145. This damper assemblywhich proportions the amount of return air at the inlet of the unitventilator casing and may be operated as a part of the turbine actuatoror through separate control means such as a pneumatic or electric motivemeans indicated at 150. The inlet supply pipe for the temperaturechanging means to the heat exchanger 160 in this embodiment is shown asincluding a manually operated valve 152 which is connected to the heatexchanger coil assembly 160 positioned within the interior of the casing115. The turbine operator operates the damper blade 165 which is pivotedon the bottom of the casing and controls the amount of induced air to bedirected across the heat exchanger coil or bypassing the same in aconventional induction unit type operation. The turbine operator 30receives its air supply through the conduit 28 leading to the source 120and is shown only schematically in FIGURE as it basically includes thesame elements shown in FIGURES 2, 3 and 4. The output shaft rather thanbeing connected directly to the valve is connected through a linkageassembly 168 to the pivoted damper for positioning the same. Althoughnot shown, however, it will be understood that the changeover operationwill be obtained from a thermal element associated with the heatexchanger to operate a pivoted linkage and efifecting operation of achangeover valve (not shown). The thermostat control line 32 is showndotted extending through the casing 115 and up to the space to be airconditioned (not shown) wherein the thermostat 35 is to be located.

In operation, this apparatus is the same as that disclosed in connectionwith FIGURE 1 except that the bypass damper will control the amount ofinduced air directed across the heat exchanger rather than the flow oftemperature changing medium through the coil to effect tempering of theair in accordance with the thermostat requirements. It will beunderstood also that the turbine actuator may also, through suitablelinkage means, operate the damper to control the amount of recirculatedair to the interior of the casing 110 to be induced over the heatexchanger coil or bypassing the same.

FIGURE 6 shows a second schematic disclosure of a pneumatic controlcircuit which may also be used either in control of a damper or as avalve control such as is shown in FIGURE 1. This pneumatic controlcircuit differs from the embodiment of FIGURE 4 in the use of adifferent type of changeover circuitry and in a slightly different typeof feedback cam as will be hereinafter explained. Basically, theapparatus may be applied to the disclosure of FIGURE 5 in the samemanner that FIG- URE 4 is applicable thereto. It utilizes the same inputsupply condut 28 connected to an inlet pipe 68 to the filter 70 as theair source for the control apparatus and the turbine. The turbine, as inthe previous embodiment, may be directly connected to a high pressureair source 28. The turbine 38 has associated therewith the manifoldsection 42 to which the air supply conduit 44 from the air source 28 isconnected. Similarly, the filter 70 supplies air for the control portionof the turbine drive apparatus through a slightly different arrangementof parts. Thus, as seen in FIGURE 6, the filter has connected thereto aconduit 166 leading to a conduit 167 having a restriction 16S therein.This latter conduit with the restriction 168 therein leads to thechamber 61 of the relay 56 or motive means for the valve or blade 51 inthe manifold 42. Blade 51 is pivoted as at 52 within the manifold 42.The casing 519 of the relay has a slight aperture through which theoperating shaft 55 of the relay extends. The conduit 166 terminates in aconduit 170 adjacent the point on the relay casing through which shaft55 extends and the opening through which the shaft extends form arestriction from this supply conduit 170 to the relay chamber 60.Leading from the relay chamber 60 is a conduit 172 which extends to achangeover valve shown generally at 175, this changeover valve having apair of outlet conduits 176, 177 associated therewith. The changeovervalve shown in section in FIGURE 6 includes basically a shiftable valveclosure member 180 which is attached to a motive means or expansionelement 181 associated with the temperature sensor 98. The valve closuremember 180 is shifted within an opening 182 in the casing 184 of thechangeover valve to connect one or the other of the conduits 176, 177 tothe inlet conduit 172. The conduits 176, 177 terminate in reverse anddirect acting bleed type thermostats included in the general thermostat35.

Thus, in this embodiment, the thermostat includes separate bimetals andnozzles forming the two thermostats indicated at 185, 186. Thethermostat 185 includes a bimetal 188 and a nozzle 189 to which theconduit 177 is connected. Similarly the thermostat 186 includes abimetal 192 and a nozzle 194 to which the control conduit 176 isconnected. The thermostat 185 is designated the reverse actingthermostat as used on the cooling cycle for turbine operation while thedirect acting thermostat 186 is used in the heating application. Byshifting the changeover valve 175, one or the other of the conduits 176,177 and hence one or the other of the thermostats 185, 186 will beconnected into the control conduit 172 leading to the motive chamber 60of the relay or motive means shifting the splitter valve means withinthe turbine manifold 42.

In addition, the relay'56 has its motive chamber 61 connected by meansof a conduit 196 to the feedback flapper nozzle arrangement 65 includingthe nozzle 88 and the flapper 89. In this embodiment the follower 89cooperates with a slightly different shaped cam 200 shown positioned onthe turbine assembly and adapted to be connected to the same throughsuitable gear means (not shown). The cam associated with the outputshaft also has connected thereto the damper lever 168 and the maximumrotation of this apparatus is limited to 180 rotation. Cam 200 in thisembodiment has a single rise portion falling off to a dwell or low point180 removed therefrom so that maximum pressure at the feedback nozzlewill be obtained at one point on the cam and minimum at the otherthrough the entire range of rotation of the cam. Thus, as in theembodiment of FIGURE 4, the thermostat will control one side of therelay and the feedback pressure the other so that proportional operationmay be obtained from the control vane or blade 51 within the nozzlemanifold 42 to proportion the flow of air to each side of the turbineand provide a resultant rotation in accordance with the conditionsensed. Changeover from one thermostat to the other is effected by thechangeover valve which selectively connects one or the other of thebleed nozzles of the thermostats 186, 187 to the chamber 60 in the relayto vary the pressure therein and control the positioning of the controlvane or blade within the manifold to provide the desired direction andamount of rotation. This changeover valve, as in the precedingembodiments, is operated by a temperature sensor responding to thetemperature of the water or temperature changing medium in the pipeflowing to the heat exchanger (not shown). This arrangement of partswill function basically in the same manner as that described inconnection with FIGURE 4.

In considering this invention it should be remembered that the presentdisclosure is intended to be illustrative only and the scope of theinvention should be determined only by the appended claims.

I claim as my invention:

1. Air conditioning control apparatus comprising, an air driven turbineincluding a pivoted turbine wheel and a nozzle manifold positionedadjacent to and fitting around a portion of said pivoted wheel, an airinlet passage in said manifold, a pair of discharge nozzles positionedin said nozzle manifold adjacent opposite surfaces of said turbinewheel, the inlet passage to said nozzle manifold being connected to asource of temperate air to be supplied to a space to be air conditioned,a first control conduit connected to said source of air and to a bleedtype thermostat positioned in and responsive to the temperature of thespace to be air conditioned, a diverting valve in said nozzle manifoldto proportion the flow of conditioned air from said source to saidnozzles to control the direction of rotation of said turbine wheel,motive means for operating said diverting valve including pressureresponsive means, said pressure responsive means being connected to saidfirst named control conduit, output gearing connected to said turbinewheel and to a controller for controlling the flow of conditioned air tobe supplied to said space, a cam on the final stage of said outputgearing being positioned thereby and having a rise portion correspondingto the limit of travel of said gearing and a limiting position of saidcontroller, nozzle flapper means associated with said cam on said outputgearing, second control conduit means connected from said source ofsupply to said nozzle flapper means and including said pressureresponsive means to provide a pressure in opposition to a pressureestablished by said thermostat to effect feedback operation on themotive means controlling said diverting valve.

2. Air conditioning control apparatus comprising, an air driven turbineincluding a pivoted turbine wheel and a nozzle manifold positionedadjacent to and fitting around a portion of said pivoted wheel, an airinlet passage in said nozzle manifold, a pair of discharge nozzlespositioned in said nozzle manifold adjacent opposite surfaces of saidturbine wheel, the inlet passage to said nozzle manifold being connectedto a source of temperate air to be supplied to a space to be airconditioned, a first control conduit connected to said source of air andto a bleed type thermostat positioned in and responsive to thetemperature of the space to be air conditioned, a diverting valve insaid nozzle manifold to proportion the flow of conditioned air from saidsource to said nozzles to control the direction of rotation of saidturbine wheel, an actuating relay for operating said diverting valveincluding pressure responsive means, said pressure responsive meansbeing connected to said first named control conduit, output gearingconnected to said turbine wheel and to a controller for controlling theamount of conditioned air to be supplied to said space, a cam connectedto said output gearing and positioned thereby having a rise portioncorresponding to the limit of travel of said gearing and a limitingposition of said controller, nozzle flapper means associated with saidcam on said output gearing, second control conduit means connected fromsaid source of supply to said nozzle flapper means and including saidpressure responsive means to provide a pressure in opposition to apressure established by said thermostat to effect feedback operation onthe actuating relay controlling said diverting valve, said cam on saidoutput gearing being effective to increase the pressure in said nozzleflapper and hence the pressure responsive means of said actuating relayin opposition to the thermostat pressure as the turbine is operatedtoward said limit position.

3. Air conditioning control apparatus comprising, an air driven turbineincluding a pivoted turbine wheel and a nozzle manifold positionedadjacent to and fitting around a portion of said pivoted wheel, an airinlet passage to said manifold, a pair of discharge nozzles positionedin said nozzle manifold adjacent opposite surfaces of said turbinewheel, the inlet passage to said nozzle manifold being connected to asource of temperate air to be supplied to a space to be air conditioned,a first control conduit connected to said source of conditioned air andto a bleed type thermostat positioned in and responding to thetemperature of the space to be air conditioned, a diverting valve insaid nozzle manifold to proportion the flow of conditioned air from saidsource to said nozzles to control the direction of rotation of saidturbine wheel, motive means for operating said diverting valve includingpressure responsive means, said pres sure responsive means beingconnected to said first named control conduit, output gearing connectedto said turbine wheel and connected to a controller for controlling theamount of conditioned air to be supplied to said space, a cam mounted onsaid output gearing to be positioned thereby and having a rise portioncorresponding to the limit of travel of said gearing and a limitingposition of said controller, nozzle flapper means associated with saidcam on said output gearing, second control conduit means connected fromsaid source of supply to said nozzle flapper means and including saidpressure responsive means to provide a pressure in opposition to apressure established by said thermostat to effect feedback operation onthe motive means controlling said diverting valve, and changeover valvemeans connected to the control conduits leading to said thermostat andsaid feedback nozzle and flapper and adapted to reverse the connectionsbetween said thermostat, said nozzle flapper and said pressureresponsive means of said motive means, said changeover valve means beingeffective to reverse the operation of said turbine for given temperaturechanges in said space.

4. Air conditioning control apparatus comprising, an air driven turbineincluding a pivoted turbine wheel and a nozzle manifold positionedadjacent to and fitting around a portion of said pivoted wheel, an airinlet passage to said manifold, and a pair of discharge nozzlespositioned in said nozzle manifold adjacent opposite surfaces of saidturbine Wheel, the inlet passage to said nozzle manifold being connectedto a source of temperate air to be supplied to a space to be airconditioned, a first control conduit connected to said source ofconditioned air and to a bleed type thermostat positioned in andresponding to the temperature of the space to be air conditioned, adiverting valve in said nozzle manifold to proportion the flow ofconditioned air from said source to said nozzles to control thedirection of rotation of said turbine wheel, motive means for operatingsaid diverting valve including pressure responsive means, said pressureresponsive means being connected to said first named control conduit,output gearing connected to said turbine wheel and connected to acontroller for controlling the amount of conditioned air to be suppliedto said space, a cam connected to said output gearing to be positionedthereby and having a rise portion corresponding to the limit of travelof said gearing and a limiting position of said controller, nozzleflapper means associated with said cam on said output gearing, secondcontrol conduit means connected from said source of supply to saidnozzle flapper means and including said pressure responsive means toprovide a pressure in opposition to a pressure established by saidthermostat to effect feedback operation on the motive means controllingsaid diverting valve, changeover valve means connected to the controlconduits leading to said thermostat and said feedback nozzle and flapperto reverse the connections between said thermostat, said nozzle flapperand said pressure responsive means of said motive means, said changeovervalve means being effective to reverse the operation of said turbine forgiven temperature changes in said space, and temperature responsivemeans responsive to a factor controlling the temperature of said airconditioning medium for operating said changeover valve.

5. Air conditioning control apparatus comprising, an air driven turbineincluding a pivoted turbine wheel and a nozzle manifold positionedadjacent to and around a portion of said pivoted rotor Wheel, a pair ofdischarge nozzles positioned in said manifold on opposite surfaces ofsaid turbine wheel to selectively cause rotation of said turbine Wheelin opposite directions, an inlet passage to said manifold connected to asource of air conditioning medium to supply a space to be airconditioned, means Within said manifold for proportioning the flow ofair to said nozzles to cause direction of rotation of said turbinewheel, gearing associated with said turbine Wheel and including anoutput shaft connected to a controller for controlling the fiow ofconditioned air to be supplied to said space, means for operating saidlast named means to differentially direct flow through said manifoldnozzles, a primary controller responsive to a factor affected by saidconditioned air and determining the need for operation of saidcontroller controlling the supply of conditioned air to said space toestablish a first branch line pressure, means associated with saidoutput shaft to establish a feedback pressure in accordance with theposition of operation of said turbine and controller, said branch linepressure and said feedback pressure differentially controlling the meansoperating said proportioning means to control the direction of rotationof said turbine.

6. Air conditioning control apparatus comprising, an air driven turbineincluding a pivoted turbine Wheel and a nozzle manifold positionedadjacent to and around a portion of said pivoted rotor wheel, a pair ofdischarge nozzles positioned in said manifold on opposite surfaces ofsaid turbine wheel to selectively cause rotation of said turbine Wheelin opposite directions, an inlet passage to said manifold connected to asource of air conditioning medium to supply a space to be airconditioned, means Within said manifold for proportioning the flow ofair to said nozzles to cause direction of rotation of said turbinewheel, gearing associated with said turbine Wheel and including anoutput shaft connected to a controller for controlling the flow ofconditioned air to be supplied to said space, means for operating saidlast named means to differentially direct flow through said manifoldnozzles, a primary controller responsive to a factor affected by saidconditioned air and determining the need for operation of saidcontroller controlling the supply of conditioned air to said space toestablish a first branch line pressure, means associated with saidoutput shaft to establish a feedback pressure in accordance with theposition of operation of said turbine and controller, said branch linepressure and said feedback pressure differentially controlling the meansoperating said diverting means to control the direction of rotation ofsaid turbine, and means for reversing the effect of said branch andfeedback pressures on said operating means.

7. Air conditioning control apparatus comprising, an air driven turbineincluding a pivoted turbine wheel and a nozzle manifold positionedadjacent to and fitting around a portion of said pivoted wheel, an airinlet passage in said nozzle manifold, a pair of discharge nozzlespositioned in said nozzle manifold adjacent opposite surfaces of saidturbine wheel, the inlet passage to said nozzle manifold being connectedto a source of temperate air to be supplied to a space to be airconditioned, a first control conduit connected to said source ofconditioned air and to a bleed type thermostat positioned in andresponsive to the temperature of the space to be air conditioned, adiverting valve in said nozzle manifold to proportion the flow ofconditioned air from said source to said nozzles to control thedirection of rotation of said turbine Wheel, motive means for operatingsaid diverting valve, means connecting said first named control conduitto said motive means, output gearing connected to said turbine wheel andconnected to a controller for controlling the amount of conditioned airto be supplied to said space, a cam on said output gearing beingpositioned thereby and having a rise portion corresponding to the limitof travel of said gearing, pneumatic control means operated by said camon said output gearing, second control conduit means connected from saidsource of supply to said nozzle flapper means and including additionalconduit means connected to said motive to provide a pressure inopposition to a pressure established by said thermostat to effectfeedback operation on the motive means controlling said diverting valve.

8. Air conditioning control apparatus comprising, an

iii

air driven turbine including a pivoted turbine Wheel and a nozzlemanifold positioned adjacent to and fitting around a portion of saidpivoted Wheel, an air inlet passage in said manifold, a pair ofdischarge nozzles positioned in said nozzle manifold adjacent oppositesurfaces of said turbine Wheel, the inlet passage to said nozzlemanifold being connected to a source of temperate air supplied to aspace to be air conditioned, a first control conduit connected to saidsource of conditioned air and to a bleed type thermostat positioned inand respond to the temperature of the space to be air conditioned, adiverting valve in said nozzle manifold to proportion the flow ofconditioned air from said source to said nozzles to control thedirection of rotation of said turbine wheel, an actuating relay foroperating said diverting valve including pressure responsive means, saidpressure responsive means being connected to said first named controlconduit, output gearing connected to said turbine wheel and connected toa controller for controlling the amount of conditioned air to besupplied to said space, a cam connected to said output gearing andpositioned thereby and having rise portions corresponding to the limitsof travel of said gearing and limiting positions of said controller,nozzle flapper means associated with said cam on said output gearing,second control conduit means connected from said source of supply tosaid nozzle flapper means and connected to said pressure responsivemeans to provide a pressure in opposition to a pressure established bysaid thermostat to effect feedback operation on the actuating relaycontrolling said diverting valve, said cam on said output gearing beingeffective to increase the pressure in said nozzle flapper and hence thepressure responsive means of said actuating relay in opposition to thethermostat pressure as the turbine is operated toward said limitpositions.

9. Air conditioning control apparatus comprising, an air driven turbineincluding a pivoted turbine Wheel and a nozzle manifold positionedadjacent to and fitting around a portion of said pivoted wheel, an airinlet passage in said manifold, a pair of discharge nozzles positionedin said nozzle manifold adjacent opposite surfaces of said turbineWheel, the inlet passage to said nozzle manifold being connected to asource of temperate air to be supplied to a space to be air conditioned,a first control conduit connected to said source of conditioned air andto a bleed type thermostat positioned in and responding to thetemperature of the space to be air conditioned, a diverting valve insaid nozzle manifold to proportion the flow of conditioned air from saidsource to said nozzles to control the direction of rotation of saidturbine Wheel, motive means for operating said diverting valve includingpressure responsive means, said pressure responsive means beingconnected to said first named control conduit, output gearing connectedto said turbine wheel and connected to a controller for controlling theamount of conditioned air to be supplied to said space, a cam on saidoutput gearing to be positioned thereby and having rise portionscorresponding to the limits of travel of said gearing, nozzle flappermeans associated with said cam on said output gearing, second controlconduit means connected from said source of supply to said nozzlefiapper means and connected to said pressure responsive means to providea pressure in opposition to a pressure established by said thermostat toeffect feedback operation on the motive means controlling said divertingvalve, and changeover valve means connected to the control conduitsleading to sm'd thermostat and said feedback nozzle and flapper toreverse the connections between said thermostat, said nozzle flapper andsaid pressure responsive means of said motive means, said changeovervalve means being effective to reverse the operation of said turbine forgiven temperature changes in said space.

10. Air conditioning control apparatus comprising, an air driven turbineincluding a pivoted turbine Wheel and a nozzle manifold positionedadjacent to and around a portion of said pivoted rotor wheel, a pair ofdischarge nozzles positioned in said manifold on opposite surfaces ofsaid turbine Wheel to selectively cause rotation of said turbine wheelin opposite directions, an inlet passage to said manifold connected to asource of air conditioning medium to supply a space to be airconditioned, means within said manifold for proportioning the flow ofair to said nozzles to cause direction of rotation of said turbinewheel, gearing associated with said turbine wheel and including anoutput shaft connected to a controller for controlling the amount ofconditioned air to be supplied to said space, means for operating saidlast named means to differentially direct flow through said manifoldnozzles, a primary controller connected to said source and responsive toa factor affected by said conditioned air and determining the need foroperation of said controller to establish a first branch line pressure,means associated with said output shaft connected to said source toestablish a feedback pressure in accordance with the position ofoperation of said turbine and controller, means connecting said primarycontroller and said means associated with said output shaft to saidoperating means so that said branch line pressure and said feedbackpressure differentially control the means operating said proportioningmeans to control the direction of rotation of said turbine.

11. Air conditioning control apparatus comprising, an air driven turbineincluding a pivoted turbine wheel and a nozzle manifold positionedadjacent to and around a portion of said pivoted rotor Wheel, a pair ofdischarge nozzles positioned in said manifold on opposite surfaces ofsaid turbine Wheel to selectively cause rotation of said turbine wheelin opposite directions, an inlet passage to said manifold connected to asource of air conditioning medium which source is adapted to supply aspace to be air conditioned, means within said manifold forproportioning the flow of air to said nozzles to cause direction ofrotation of said turbine wheel, gearing associated with said turbinewheel and including an output shaft connected to a controller forcontrolling the amount of conditioned air to be supplied to said space,means for operating said last named means to differentially direct flowthrough said manifold nozzles, a primary controller connected to saidsource and to a factor affected by said conditioned air and determiningthe need for operation of said controller controlling the supply ofconditioned air to said space to establish a first branch line pressure,means associated with said output shaft and connected to said source toestablish a feedback pressure in accordance with the position ofoperation of said turbine and controller, means connecting saidcontroller and said last named means establishing said branch linepressure and said feedback pressure differentially to the meansoperating said proportioning means to control the direction of rotationof said turbine, and means for reversing the last named connecting meansto reverse the effect of said branch and feedback pressures on saidproportioning means.

12. Air conditioning control apparatus comprising, an air driven turbineincluding a pivoted turbine wheel and a nozzle manifold positionedadjacent to and fitting around a portion of said pivoted wheel, an airinlet passage to said manifold, a pair of discharge nozzles positionedin said nozzle manifold adjacent opposite surfaces of said turbinewheel, the inlet passage to said nozzle manifold connected to a sourceof temperate air to be supplied to a space to be air conditioned, afirst control conduit connected to said source of conditioned air and toa bleed type thermostat positioned in and responding to the temperatureof the space to be air conditioned, a diverting valve in said nozzlemanifold to proportion Cir the flow of conditioned air from said sourceto said nozzles to control the direction of rotation of said turbinewheel, motive means for operating said diverting valve includingpressure responsive means, said pressure responsive means beingconnected to said first named control conduit, output gearing connectedto said turbine wheel and to a controller for controlling the amount ofconditioned air to be supplied to said space, a cam mounted on saidoutput gearing to be positioned thereby and having a rise portioncorresponding to the limit of travel of said gearing and a limitingposition of said controller, nozzle flapper means associated with saidcam on said output gearing, second control conduit means connected fromsaid source of supply to said nozzle fiapper means and including saidpressure responsive means to provide a pressure in opposition to apressure established by said thermostat to effect feedback operation onthe motive means controlling said diverting valve, and changeover valvemeans included in at least one of said conduits from said motive meansand operative to reverse the operation of said motive means and saidturbine with a given change in temperature in the space to be airconditioned.

13. Air conditioning control apparatus comprising, an air driven turbineincluding a pivoted turbine wheel and a nozzle manifold positionedadjacent to and fitting around a portion of said pivoted wheel, an airinlet passage in said manifold, and a pair of discharge nozzlespositioned in said nozzle manifold adjacent opposite surfaces of saidturbine wheel, the inlet passage to said nozzle manifold being connectedto a source of temperate air to be supplied to a space to be airconditioned, a first control conduit connected to said source ofconditioned air and to a bleed type thermostat positioned in andresponding to the temperature of the space to be air conditioned, adiverting valve in said nozzle manifold to proportion the flow ofconditioned air from said source to said nozzles to control thedirection of rotation of said turbine Wheel, motive means for operatingsaid diverting valve including pressure responsive means, said pressureresponsive means being connected to said first named control conduit,output gearing connected to said turbine Wheel and connected to acontroller for controlling the amount of conditioned air to be suppliedto said space, a cam connected to said output gearing to be positionedthereby and having a rise portion corresponding to the limit of travelof said gearing and a limiting position of said controller, nozzleflapper means associated with said cam on said output gearing, secondcontrol conduit means connected from said source of supply to saidnozzle flapper means and including said pressure responsive means toprovide a pressure in opposition to a pressure established by saidthermostat to effect feedback operation on the motive mean controllingsaid diverting valve, changeover valve means connected to the controlconduits leading to said thermostat to reverse the connection betweensaid thermostat and said pressure responsive means of said motive means,said changeover valve means being effective to reverse the operation ofsaid turbine for given temperature changes in said space, andtemperature responsive means responsive to a factor controlling thetemperature of said air conditioning medium for operating saidchangeover valve.

References Cited in the file of this patent UNITED STATES PATENTS

1. AIR CONDITIONING CONTROL APPARATUS COMPRISING, AN AIR DRIVEN TURBINEINCLUDING A PIVOTED TURBINE WHEEL AND A NOZZLE MANIFOLD POSITIONEDADJACENT TO AND FITTING AROUND A PORTION OF SAID PIVOTED WHEEL, AN AIRINLET PASSAGE IN SAID MANIFOLD, A PAIR OF DISCHARGE NOZZLES POSITIONEDIN SAID NOZZLE MANIFOLD ADJACENT OPPOSITE SURFACES OF SAID TURBINEWHEEL, THE INLET PASSAGE TO SAID NOZZLE MANIFOLD BEING CONNECTED TO ASOURCE OF TEMPERATE AIR TO BE SUPPLIED TO A SPACE TO BE AIR CONDITIONED,A FIRST CONTROL CONDUIT CONNECTED TO SAID SOURCE OF AIR AND TO A BLEEDTYPE THERMOSTAT POSITIONED IN AND RESPONSIVE TO THE TEMPERATURE OF THESPACE TO BE AIR CONDITIONED, A DIVERTING VALVE IN SAID NOZZLE MANIFOLDTO PROPORTION THE FLOW OF CONDITIONED AIR FROM SAID SOURCE TO SAIDNOZZLES TO CONTROL THE DIRECTION OF ROTATION OF SAID TURBINE WHEEL,MOTIVE MEANS FOR OPERATING SAID DIVERTING VALVE INCLUDING PRESSURERESPONSIVE MEANS, SAID PRESSURE RESPONSIVE MEANS BEING CONNECTED TO SAIDFIRST NAMED CONTROL CONDUIT, OUTPUT GEARING CONNECTED TO SAID TURBINEWHEEL AND TO A CONTROLLER FOR CONTROLLING THE FLOW OF CONDITIONED AIR TOBE SUPPLIED TO SAID SPACE, A CAM ON THE FINAL STAGE OF SAID OUTPUTGEARING BEING POSITIONED THEREBY AND HAVING A RISE PORTION CORRESPONDINGTO THE LIMIT OF TRAVEL OF SAID GEARING AND A LIMITING POSITION OF SAIDCONTROLLER, NOZZLE FLAPPER MEANS ASSOCIATED WITH SAID CAM ON SAID OUTPUTGEARING, SECOND CONTROL CONDUIT MEANS CONNECTED FROM SAID SOURCE OFSUPPLY TO SAID NOZZLE FLAPPER MEANS AND INCLUDING SAID PRESSURERESPONSIVE MEANS TO PROVIDE A PRESSURE IN OPPOSITION TO A PRESSUREESTABLISHED BY SAID THERMOSTAT TO EFFECT FEEDBACK OPERATION ON THEMOTIVE MEANS CONTROLLING SAID DIVERTING VALVE.